{"paper":{"title":"The APOGEE-2 Survey of the Orion Star Forming Complex II: Six-dimensional structure","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"Adam Burgasser, Alexandre Roman-Lopes, Carlos Rom\\'an-Z\\'u\\~niga, Christian Nitschelm, D. A. Garc\\'ia-Hern\\'andez, Eric D. Feigelson, Genaro Su\\'arez, Guy S. Stringfellow, Jesus Hernandez, Jos\\'e G. Fern\\'andez-Trincado, J. Serena Kim, Jura Borissova, Kaike Pan, Karla Pe\\~na Ram\\'irez, Karl O Jaehnig, Keivan Stassun, Kevin Covey, Marina Kounkel, Nicola Da Rio, Olga Zamora","submitted_at":"2018-05-12T04:27:07Z","abstract_excerpt":"We present an analysis of spectrosopic and astrometric data from APOGEE-2 and Gaia DR2 to identify structures towards the Orion Complex. By applying a hierarchical clustering algorithm to the 6-dimensional stellar data, we identify spatially and/or kinematically distinct groups of young stellar objects with ages ranging from 1 to 12 Myr. We also investigate the star forming history within the Orion Complex, and identify peculiar sub-clusters. With this method we reconstruct the older populations in the regions that are presently largely devoid of molecular gas, such as Orion C (which includes "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1805.04649","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}